JP6507704B2 - Wireless communication system, wireless device, wireless communication method, packet generation method and data recovery method from packet - Google Patents

Description

  The present invention relates to a wireless communication system that employs digital voice communication, a wireless device used in the system, a wireless communication method corresponding to the system, a method of generating packets, and a method of reproducing data from packets.

  2. Description of the Related Art In recent years, in the world of amateur radio and the like, digitization and networking of voice communication are spreading in order to realize faster communication and enjoy clear voice communication. Then, in a wireless communication system that employs this digital voice communication, the voice signal is encoded, converted into a digital signal, packetized, and transmitted (for example, see Patent Document 1).

  In the above-described wireless communication system, an analog method such as specifying and communicating with a wireless device of the opposite station in accordance with the addition of data indicating a call sign of a transmission destination, a transmission source, etc. in a header portion of a packet It has become possible to realize many functions that could not be achieved with wireless communication systems.

  Furthermore, in the above-described wireless communication system, data for voice communication and data for data communication are simultaneously transmitted by alternately repeating a voice frame and data frame of a predetermined length successively and continuously following the header portion. can do.

  Therefore, if this function is used, for example, while communicating, an image signal taken by a camera is transmitted from one wireless device to the other wireless device and displayed on the display to enjoy conversation while watching the image. You can also.

JP, 2006-157477, A

  On the other hand, since the above-described wireless communication system is based on voice communication, the amount of data that can be transmitted for data communication is set smaller than the amount of data for voice communication. Communication speed is not always fast.

  For this reason, since only a part of the image signal can be transmitted in one call and the user can not enjoy the conversation while viewing the image, the user has requested improvement.

  The present invention has been made in view of such conventional problems, and by utilizing a voice frame after transmission of a voice signal is discontinued, the amount of data of data communication that can be transmitted in one call can be reduced. An object of the present invention is to provide an increased wireless communication system.

In order to achieve the above object, a wireless communication system according to the present invention is composed of at least two radios, and the radios convert analog voice signals into digital voice signals after A / D conversion and encoding, and A packet including the digital audio signal is generated, the packet is converted into a wireless signal and transmitted, and the packet converted into the wireless signal is received, the digital audio signal is extracted from the packet, and the analog audio signal A wireless communication system that converts
Each of the radios
As the packet, the header portion includes at least data of an identifier for identifying a transmission destination and a transmission source radio station, and voice and data frames of a predetermined length are alternately and continuously arranged in the data portion. A transmitter configured to generate a packet in which a mini header in which information indicating the type of data is described is inserted in a frame;
A receiver that reproduces a packet from the received wireless signal and extracts data of the digital audio signal from the packet;
A controller that transmits data necessary for generating a packet including various commands and the identifier to the transmission unit, and instructs the reception unit to reproduce the packet from the received radio signal ,
The controller of the transmitter-side radio, to said transmitting unit transmits a first command for instructing the start of transmission when detecting the start of a voice call, and packet when detecting the end of voice communication Send a second command to change the form,
Before Kioku trust unit,
When the first command is received from the controller, data of an audio signal is inserted into the audio frame, and a packet in which data for data communication is inserted into the data frame is generated.
When the second command is received from the controller, data for data communication is inserted into the voice frame and the data frame for a certain period from the time point, and a packet in which a closing frame is finally inserted is generated.
The controller of the receiving side radio that receives a radio signal, analyzes the information of Minihedda extracted from the packet reproduced by the reception unit, check the type of data that is inserted into the speech frame,
The receiving unit extracts data from the packet in accordance with the confirmation result of the controller, and reproduces the digital audio signal and data for data communication.

  Here, it is preferable that information indicating that data for data communication is inserted in the voice frame is described in the mini header in the predetermined period.

  Preferably, the transmitting unit stops the generation of the packet when there is no data for data communication to be inserted into the voice frame and the data frame during the predetermined period.

  Furthermore, the present invention includes a radio that implements the above-described wireless communication system, a wireless communication method corresponding to the above-described wireless communication system, a method of generating packets, and a method of data recovery from packets.

  When the wireless communication system according to the present invention is used, the voice frame of the packet is replaced with data for voice communication for a certain period from when the transmitting unit receives the command output from the controller in response to the PTT switch being turned off. By inserting data for data communication, it is possible to increase the amount of data for data communication that can be transmitted during one call, and as a result, to increase the communication speed of data communication.

It is a block diagram which shows the structure of the radio | wireless machine used by the radio | wireless communications system concerning embodiment of this invention. It is a figure which shows the structure of the packet transmitted by a radio | wireless machine. It is a figure which shows the kind of data inserted in each flame | frame of the data part of a packet. It is a figure which shows the typical usage form of the radio | wireless communications system using the radio | wireless machine of this Embodiment. It is a flow chart of the flow of processing in a transmitting part from the start of transmission of a packet until it stops. It is a figure which shows the signal transmitted to a transmission part from a controller in the period after starting transmission of a packet until it stops, and the kind of data transmitted by packet. It is a flowchart which shows the flow of a process in the controller of the radio | wireless machine which received the packet.

  Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings.

<Configuration of wireless device>
FIG. 1 shows the configuration of a wireless device used in the wireless communication system according to the present embodiment. The wireless device 1 includes a microphone 11, a speaker 12, an AF amplifier 13, an audio codec 14, a transmitting unit 15, a transmission / reception switching unit 16, an antenna 17, a receiving unit 18, an interface unit 19, a controller 21, an operation unit 26 and a display unit 28. It is configured. In the figure, thick arrows indicate the flow of voice signals and data, and thin arrows indicate the flow of signals in the control system.

  Microphone 11 receives an audio for transmission as input to generate an analog audio signal, and outputs the audio signal to AF amplifier 13. On the other hand, the speaker 12 converts the analog voice signal output from the AF amplifier 13 into voice.

  An AF (Audio Frequency) amplifier 13 amplifies an analog audio signal input from the microphone 11 and supplies the amplified audio signal to an audio codec 14. In addition, the analog audio signal of the received voice supplied from the audio codec 14 is amplified and output to the speaker 12.

  The audio codec 14 A / D (analog / digital) converts and encodes the analog audio signal supplied from the AF amplifier 13 and outputs the converted signal to the transmitting unit 15. The audio codec 14 also decodes the digital audio signal supplied from the receiving unit 18 and further performs D / A (digital / analog) conversion, and outputs the signal to the AF amplifier 13.

  The transmitting unit 15 attaches a header for wireless communication to the digital audio signal supplied from the audio codec 14 and divides the digital audio signal based on the output of a PTT switch 27 described later to generate a transmission packet shown in FIG. The configuration of the packet will be described in detail later using FIG. The transmission unit 15 further modulates the carrier wave with digital data forming a packet, performs frequency conversion as necessary, and transmits the signal from the antenna 17 via the transmission / reception switching unit 16.

  The transmission / reception switching unit 16 guides the transmission signal from the transmission unit 15 to the antenna 17 when the PTT switch 27 is pressed and turned on, and guides the reception signal of the antenna 17 to the receiving unit 18 when the PTT switch 27 is released and turned off. .

  The receiving unit 18 switches the reception frequency according to the instruction signal from the controller 21, tunes to the reception frequency, amplifies the reception signal, and further demodulates and reproduces the packet. Then, the header portion is removed from the reproduced packet, audio data is supplied to the audio codec 14, and other data (for example, packet data such as an image signal) is supplied to the interface unit 19.

  The interface unit 19 is connected to an external device (for example, a personal computer or a smartphone) (not shown) via the external connection terminal 20, and supplies packet data such as an image signal supplied from the external device to the transmitting unit 15 or the controller 21. The interface unit 19 also supplies the packet data supplied from the receiving unit 18 to an external device via the external connection terminal 20.

  The controller 21 controls the operation of the wireless device 1. The controller 21 includes a central processing unit (CPU) 22, a read only memory (ROM) 23 storing a program defining the operation of the CPU 22, a random access memory (RAM) 24 functioning as a work memory for the CPU 22, and a call sign. A non-volatile memory 25 for storing data is provided.

  The operation unit 26 transmits various inputs and user instructions to the controller 21. The operation unit 26 includes a PTT (Push To Talk) switch 27. When the PTT switch 27 is pressed (turned on), the transmission / reception switching unit 16 switches to the transmission side and transmission is performed from the antenna 17, and when released (turned off), the transmission / reception switching unit 16 switches to the reception side and received The audio signal is played back.

  The display unit 28 is configured of a liquid crystal display or the like, and is used to display various data. The screen of the display unit 28 displays that the wireless device 1 has received an amateur radio signal (a call has been made), a transmission source (the own station), a call sign of the transmission destination (the opposite station), a nickname, etc. Ru.

<Packet Configuration>
Next, the configuration of the packet generated by the transmitter 15 will be described with reference to FIGS. 2 and 3. The configuration of the packet indicates how to combine and transmit a series of data of digital voice communication in what order.

  As shown in FIG. 2, the packet Pa is composed of a header part Ph and a data part Pd. The header portion Ph includes a synchronization signal h1, a flag h2, a call sign h3 of a transmission destination repeater, a call sign h4 of a transmission source repeater, a transmission destination call sign h5, and a transmission source call sign h6.

  The synchronization signal h1 in the header part Ph synchronizes the received signal and indicates that it is a signal. The flag h2 is data representing communication via repeaters, direct communication, repeater control signals, etc., and is composed of data of a plurality of bits.

  The call sign h3 of the destination repeater is, for example, the call sign of the repeater in the repeater area to which the destination radio station belongs, and the call sign h4 of the sender repeater is the call sign of the repeater in the repeater area to which the source radio station belongs. . The destination call sign h5 is the call sign of the transmission destination station, and the transmission source call sign h6 is the call sign of the own station. These call signs (h3 to h6) serve as an identifier for identifying a destination and a source radio station, and further, a repeater station which relays a radio signal. The destination call sign h5 may be a CQ calling an unspecified station.

  The data unit Pd is used for data communication of an audio signal d1 of a predetermined length into which a digitized audio signal is inserted, data communication for data such as an image signal or message so that data for voice communication and data for data communication can be simultaneously transmitted. The data frames d2 of a predetermined length in which the data of (1) are inserted are alternately arranged, and finally the end talk frame d3 indicating the end of the packet is added.

  The data frame d2 is replaced by a resynchronization frame d4 in which a synchronization signal for synchronization with the radio of the transmission destination station is inserted at regular intervals (for example, 420 mS).

  Next, data for data communication to be inserted into the data frame d2 will be described based on FIG. FIG. 3 shows types of data to be inserted into each frame of the data section Pd. In the figure, "voice" indicates that a voice signal is inserted in a frame, and "data" indicates that data for data communication is inserted in a frame.

  In the audio frame d1 and the data frame d2 constituting the data part Pd, since the data transmission of the audio signal is prioritized, the data amount of the audio frame d1 is set larger than the data amount of the data frame d2. Usually, 9 bytes of data are inserted into the audio frame d1, and 3 bytes of data are inserted into the data frame d2.

  Furthermore, a mini header d5 describing the type of data etc. is inserted at the beginning of the data frame d2. However, if the mini-header d5 is provided for each data frame, the amount of data that can be inserted into the data frame is reduced, so normally, one mini-header d5 is inserted for every two data frames.

  Therefore, when generating the packet Pa, as shown in the lower part of FIG. 3, the communication data d6 for data communication is divided every 5 bytes, and a 1-byte mini-header d5 is added to the head to make a data block. After construction, this data block is divided into three bytes and inserted into two adjacent data frames d2.

  In the mini header d5, information indicating the type of data and the data length is described. The data length indicates the effective data length inserted in one data block. For example, consider the case of transmitting general-purpose data such as an image having a data length of 13 bytes. First, as described above, when data to be transmitted is divided into 5 bytes, it is divided into 5 bytes, 5 bytes and 3 bytes. Then, the mini header d5 is added to the head of each of the divided data. Here, assuming that the information indicating general-purpose data such as an image is 0x3, for example, the mini headers d5 of the first and second data blocks are 0x35, and the mini header d5 of the third data block is 0x33. Become.

  The controller 21 (see FIG. 1) extracts data indicating the type of data and the like from the data for data communication transmitted from the external device (not shown) via the interface unit 19 and stores the data in the RAM 24. Further, when the transmission unit 15 generates a transmission packet, the above data is read from the RAM 24 and transferred to the transmission unit 15. The transferred data is written to the mini header d5.

  On the other hand, when data for data communication is reproduced from the packet Pa reproduced by the receiving unit 18, the data contained in the two data frames d2 is the reverse of the process described above, that is, based on the information of the mini header d5. The communication data of 5 bytes are taken out from these, connected together, the data for data communication are reproduced, and transmitted to the external device connected to the terminal 20 through the interface unit 19.

<Communication operation by wireless device>
Next, with reference to FIG. 4 and FIGS. 1 to 3 described above, the communication operation using the wireless device of the present embodiment which can simultaneously operate voice communication and data communication will be described.

  FIG. 4 shows a typical usage of a wireless communication system using the wireless device shown in FIG. The smartphone 3a is connected to the portable wireless device 1a via the USB cable 4a.

  The smartphone 3a is a kind of multifunctional mobile phone, and can display an image captured by the built-in camera 31 on the screen of the display 32. Further, the smartphone 3a has a function of mutually transmitting and receiving data communication data including an image signal with the wireless device 1a.

  On the other hand, the on-vehicle wireless device 1b is connected to the smartphone 3b by Bluetooth (registered trademark) 4b, which is a type of short distance wireless communication. Communication modules conforming to the Bluetooth (registered trademark) standard are respectively mounted on the wireless device 1b and the smartphone 3b, and data can be transmitted and received wirelessly.

  If the wireless communication system shown in FIG. 4 is used, data communication is used to transmit an image captured by the camera 31 of the smartphone 3a to the smartphone 3b via the wireless devices 1a and 1b, and the image is displayed on the display 32. can do. Therefore, it is possible to enjoy a voice communication conversation while viewing the image sent via the wireless devices 1a and 1b.

  The procedure of the operation in the voice communication system shown in FIG. 4 will be described. Prior to communication, the user operates the operation unit 26 of the wireless device 1a to obtain information necessary for communication, for example, a transmission source (local station) call sign or a call sign of a repeater station, a non-volatile memory 25 (see FIG. 1). Store in

  At the time of communication, the user operates the operation unit 26 of the wireless device 1a, designates a call sign assigned to the wireless device 1b of the transmission destination in advance and a call signature of the destination repeater and designates the wireless station of the call destination.

  The information input from the operation unit 26 is notified to the transmitting unit 15 by the controller 21, and the transmitting unit 15 generates a packet in accordance with an instruction of the controller 21. As shown in FIG. 2, in the header part Ph of the packet Pa, the call sign h3 of the destination repeater, the call sign h4 of the source repeater, the call sign h5 of the destination (destination station), and the source (local station) Each information of the call sign h6 of is included.

  On the other hand, an image signal captured by the camera 31 of the smartphone 3a is transferred to the wireless device 1a via the USB cable 4a. The image signal input to the terminal 20 of the wireless device 1a is transmitted to the transmission unit 15 through the interface unit 19, and is inserted into the data frame d2 of the packet Pa in accordance with the procedure described with reference to FIG.

  The packet Pa generated by the transmission unit 15 and converted into a high frequency signal is transmitted via the transmission / reception switching unit 16 and the antenna 17. A radio signal transmitted from the wireless device 1a is relayed by a designated repeater station (not shown) to reach the wireless device 1b.

  The radio signal received by the wireless device 1 b is supplied to the receiving unit 18 via the antenna 17 and the transmission / reception switching unit 16, and is demodulated by the receiving unit 18 to reproduce the packet Pa. Furthermore, the header part Ph is removed from the packet Pa reproduced by the receiving part 18 and supplied to the audio codec 14 or the interface part 19 according to the content of the data part Pd.

  The audio data supplied to the audio codec 14 is decoded, converted into an analog audio signal, and supplied to the AF amplifier 13. The audio signal amplified by the AF amplifier 13 is output from the speaker 12 and the voice of the transmission source user is reproduced.

  On the other hand, an image signal obtained by demodulating the packet shown in FIG. 3 is supplied to the interface unit 19 and transmitted to the smartphone 3 b via the Bluetooth (registered trademark) communication module (not shown), and the display 32 is displayed. Is displayed on.

  Further, the packet Pa reproduced by the receiving unit 18 is supplied to the controller 21. The CPU 22 of the controller 21 determines whether the received packet Pa is a valid packet or not by an ECC (Error Check Code) check or the like. The CPU 22 stores data of the header part Ph of the packet Pa determined to be valid in the RAM 24 and analyzes information of the header part Ph. The CPU 22 displays the transmission destination call sign and the transmission source call sign of the received packet Pa on the display unit 28 based on the analysis result.

<Process for Speeding Up Data Communication Speed>
As described above, in the wireless device according to the present invention, data for voice communication and data for data communication can be simultaneously transmitted, but since transmission of data for voice communication is prioritized, data can be transmitted. The amount of data that can be transmitted for communication is smaller than the amount of data for voice communication.

  Therefore, for example, it takes about 3 minutes to send the image data of a picture of 320 × 240 pixels, so the other radio 1b is an image taken by the camera 31 of the smartphone 3a connected to one radio 1a. Even when trying to enjoy a conversation while displaying on the display 32 of the smartphone 3b connected to the image signal data does not reach during one call. Therefore, the function of data communication can not be fully utilized.

  Therefore, in the present invention, the communication speed of the data communication is increased by inserting the data of the image signal into the audio frame d1 of the packet Pa for a certain period of time and transmitting it after turning off the PTT switch 27.

  The process of increasing the communication speed of data communication will be described below with reference to the flowchart of FIG. 5 and the time chart of FIG.

  FIG. 5 shows the flow of processing in the transmission unit 15 from the start of transmission of the packet Pa to the stop thereof. Further, FIG. 6 shows the types of signals transmitted from the controller 21 to the transmitter 15 during the same period and types of data transmitted by the packet Pa.

  6A shows various commands transmitted from the controller 21 to the transmission unit 15, and FIG. 6B shows types of data to be inserted into a packet according to the command. In the figure, the time when the transmission unit 15 receives a command and the time when generation of a packet starts coincide with each other, but actually, there is a slight time difference before generating a packet.

  When the user turns on the PTT switch 27 to transmit an audio signal, the controller 21 detects it and, as shown in FIG. 6A, the controller 21 instructs the transmission unit 15 to start transmission at time T1. A command is transmitted, and the transmitter 15 that has received the command (Yes in step S1) starts generation of the packet Pa (step S2).

  Specifically, as shown in FIG. 6B, data of the audio signal is inserted into the audio frame d1, and a packet Pa in which data for data communication is inserted into the data frame d2 is generated. The generated packet Pa is converted into a high frequency signal by the transmission unit 15 and transmitted from the antenna 17 as a radio signal.

  Next, when the call is ended and the user turns the PTT switch 27 off, the controller 21 detects it, and as shown in FIG. 6B, transmits a command instructing to change the form of the packet at time T2. Send to section 15.

  The transmitting unit 15, which has received the packet format change command from the controller 21 (Yes in step S3), waits until the end of the audio signal data and the data communication data, and transmits the data frame for data communication to each of the audio frame d1 and the data frame d2. Data is inserted (step S4). The right half of FIG. 6B shows a packet Pa in which data for data communication is inserted in all of the voice frame d1 and the data frame d2.

  As described with reference to FIG. 3, when voice communication and data communication are simultaneously performed, data for data communication is divided every 5 bytes and inserted into two data frames d2 together with the mini header d5.

  On the other hand, when only data communication is performed, data for data communication is divided into 20-byte units, to which a mini header d5 etc. is added to form a block, and then the data of this block becomes two adjacent voice frames and two It is divided into data frames and inserted.

  Specifically, to prevent false detection of 20-byte data for data communication, 1-byte mini-header, 2-byte unique data inserted into each voice frame for noise reduction and packet loss It consists of 1-byte data to be inserted into the data frame, totaling 24 bytes of data, and these data consist of two adjacent audio frames d1 (9 bytes x 2) and two data frames d2 (3 bytes x 2) Is divided into and inserted.

  The controller 21 transmits a command instructing stopping of transmission to the transmission unit 15 at time T3 when a predetermined time τ has elapsed from time T2. When receiving the transmission stop command (Yes in step S5), the transmission unit 15 inserts the close-talk frame d3 into the packet Pa and stops the generation and transmission of the packet Pa (step S6). After that, the wireless device 1 changes to a state where it can receive wireless signals from other wireless devices.

  As shown in FIG. 6 (b), from the time T1 when the transmission unit 15 receives the transmission start command to the time T2 when the form change command is received, audio signal data is inserted into the audio frame d1, and then constant An image signal, that is, data for data communication, is inserted into the voice frame d1 until time T3 when the period τ elapses, and finally, the close-talk frame d3 is inserted. Therefore, the amount of data of data communication that can be transmitted in one packet increases, and as a result, the communication speed of data communication can be increased.

  Comparing the case where the voice signal data is inserted into the voice frame d1 of the packet Pa and the case where the data communication data is inserted, the communication speed of the data communication in the latter is about 3.5 as compared with that of the former. Since this is doubled, it is possible to significantly increase the amount of data for data communication that can be transmitted during one call.

  Next, a data reproduction method in the wireless device (the opposite station) that has been created by the procedure shown in FIG. 5 and has received the wireless signal transmitted from the wireless device (the local station) will be described. The controller 21 processes the packet Pa in accordance with the flow shown in FIG.

  The controller 21 takes data of the data frame d2 out of the data of the packet Pa reproduced from the wireless signal by the receiving unit 18 into a built-in register (not shown) (step S11), analyzes the information of the mini header, It is checked whether data for data communication is inserted in the voice frame (step S12).

  As shown in FIG. 6A, an audio signal is inserted in the audio frame d1 transmitted by the time T2 in the packet Pa. When controller 21 confirms that audio signal data is inserted in audio frame d1 (No in step S13), data (9 bytes in this embodiment) included in audio frame d1 is received from reception unit 18. ) Is instructed (step S14).

  The audio signal data extracted and joined from the receiving unit 18 is decoded and D / A converted by the audio codec 14 according to the instruction of the controller 21 and reproduced into an analog audio signal (step S15). It is output as voice.

  The controller 21 extracts the data frame d2 from the data frame d2 in parallel with the processing of steps S14 and S15, and combines the data stored in the register to reproduce data for data communication (step S16). The reproduced data for data communication is output to the interface unit 19.

  Subsequently, the controller 21 instructs the interface unit 19 to transfer the reproduced data for data communication to the external device (step S17), and the interface unit 19 follows the instruction. Output the reproduced data for data communication to an external device.

  On the other hand, data for data communication is inserted in the voice frame d1 transmitted after time T2 in the packet Pa. When the controller 21 confirms that data for data communication is inserted in the voice frame d1 (Yes in step S13), data for noise reduction from the voice frame d1 to the reception unit 18 (this embodiment In the mode of (1), it is instructed to take out data for data communication (the same 8 bytes) excluding 1 byte (step S18).

  Next, the controller 21 reconstructs data for data communication by connecting data extracted from two adjacent audio frames d1 and two data frames d2 in the reverse order of creation of the above-described block ((1) Step S19). The reproduced data for data communication is output to the interface unit 19.

  Subsequently, the controller 21 instructs the interface unit 19 to transfer the reproduced data for data communication to an external device (not shown), and the interface unit 19 instructs the process of step S17 described above. The data for data communication reproduced according to is output to the external device.

  In the above embodiment, the extension time τ is preferably set to 1 second to 10 seconds. If the extension time τ is too short, the communication speed will not be much different from the conventional one. On the other hand, if the extension time τ is too long, the voice signal from the opposite station can not be received during that time, and smooth conversation may be interrupted. Become.

  Also, when there is no data communication data transmitted from the external device before the predetermined period τ elapses, the controller 21 detects it and the above-mentioned transmission stop command is transmitted to the transmission unit 15 Ru. The transmission unit 15 stops the generation and transmission of packets in accordance with the same procedure as described above. Needless to say, the mode change command is transmitted from the controller 21 when data for data communication to be transmitted remains when the PTT switch 27 is turned off.

  Moreover, in the above-mentioned embodiment, although the smart phone was connected to the wireless device and the usage form of transmitting and receiving the image signal between the pair of smart phones has been described, the external device connected to the wireless device is not limited to the smart phone. For example, a portable information device such as a tablet terminal may be connected to the wireless device, and image signals and text data may be transmitted and received between the smartphone and the tablet terminal or the like.

1, 1a, 1b Radio 3a, 3b Smartphone 4a USB Cable 4b Bluetooth (registered trademark)
11 microphone 12 speaker 13 AF amplifier 14 voice codec 15 transmission unit 16 transmission / reception switching unit 17 antenna 18 reception unit 19 interface unit 21 controller 25 non-volatile memory 26 operation unit 27 PTT switch 28 display unit Pa packet Ph head unit Pd data unit

Claims (17)

It consists of at least two radios, and the radios convert analog audio signals into digital audio signals after A / D conversion and encoding, and then generate packets containing the digital audio signals, and further, the packets A wireless communication system for converting a radio signal into a radio signal and transmitting it, receiving a packet converted into the radio signal, extracting a digital voice signal from the packet, and converting it into an analog voice signal,
Each of the radios
As the packet, the header portion includes at least data of an identifier for identifying a transmission destination and a transmission source radio station, and voice and data frames of a predetermined length are alternately and continuously arranged in the data portion. A transmitter configured to generate a packet in which a mini header in which information indicating the type of data is described is inserted in a frame;
A receiver that reproduces a packet from the received wireless signal and extracts data of the digital audio signal from the packet;
A controller that transmits data necessary for generating a packet including various commands and the identifier to the transmission unit, and instructs the reception unit to reproduce the packet from the received radio signal ,
The controller of the transmitter-side radio, to said transmitting unit transmits a first command for instructing the start of transmission when detecting the start of a voice call, and packet when detecting the end of voice communication Send a second command to change the form,
Before Kioku trust unit,
When the first command is received from the controller, data of an audio signal is inserted into the audio frame, and a packet in which data for data communication is inserted into the data frame is generated.
When the second command is received from the controller, data for data communication is inserted into the voice frame and the data frame for a certain period from the time point, and a packet in which a closing frame is finally inserted is generated.
The controller of the receiving side radio that receives a radio signal, analyzes the information of Minihedda extracted from the packet reproduced by the reception unit, check the type of data that is inserted into the speech frame,
The wireless communication system, wherein the receiving unit extracts data from the packet in accordance with a confirmation result of the controller, and reproduces data for the digital voice signal and data communication.   The wireless communication system according to claim 1, wherein the mini header describes information indicating that data for data communication is inserted in the voice frame during the predetermined period.   The wireless communication system according to claim 1, wherein the transmission unit stops generation of the packet when there is no data for data communication to be inserted into the voice frame and the data frame during the predetermined period. Controller of the transmission side radio, when no data remains in the data communication to be transmitted upon detection of termination of the voice call, not to transmit the second command to the front Kioku signal portion, The wireless communication system according to any one of claims 1 to 3. 5. The controller according to claim 1, wherein the controller of the transmitting radio detects the start of a voice call when the PTT switch is turned on, and detects the end of the sound signal when the PTT switch is turned off. The wireless communication system according to any one. A wireless device that converts an analog voice signal into a digital voice signal after A / D conversion and encoding, generates a packet including the digital voice signal, and further converts the packet into a wireless signal and transmits the packet.
As the packet, a header portion includes at least data of an identifier for identifying a transmission destination and a transmission source radio station, and a data portion generates a packet in which voice frames of a predetermined length and data frames are alternately and continuously arranged. The transmitter to
A controller that transmits data necessary for generating a packet including various commands and the identifier to the transmission unit;
The controller transmits, to the transmission unit, a first command instructing start of transmission when detecting start of voice call, and instructs change of form of packet when end of voice call is detected. Send a second command,
The transmission unit is
When the first command is received from the controller, data of an audio signal is inserted into the audio frame, and a packet in which data for data communication is inserted into the data frame is generated.
When the second command is received from the controller, data for data communication is inserted into the voice frame and the data frame for a certain period of time from that point of time, and a packet in which the closing frame is finally inserted is generated. A feature radio.   The wireless device according to claim 6, wherein the transmission unit stops generation of the packet when there is no data for data communication to be inserted into the voice frame and the data frame during the predetermined period. Wherein the controller, when no data remains in the data communication to be transmitted upon detection of termination of the voice call, not to transmit the second command to the front Kioku signal unit, according to claim 6 or 7 The radio described in.   The controller according to any one of claims 6 to 8, wherein the controller detects the start of a voice call when the PTT switch is turned on and detects the end of the sound signal when the PTT switch is turned off. transceiver.   10. The wireless device according to any one of claims 6 to 9, wherein the transmission unit generates a packet in which a mini header in which information indicating a type of data is described is inserted in the data frame. And a receiver configured to reproduce the packet from the received radio signal and to extract digital audio signal data from the packet.
The controller analyzes information of a mini header extracted from the packet reproduced by the receiving unit, and confirms a type of data inserted in the voice frame;
The wireless device according to any one of claims 6 to 10, wherein the receiving unit extracts data from the packet according to a confirmation result of the controller and reproduces data for the digital audio signal and data communication. It consists of at least two radios, which are:
The header portion includes at least data of an identifier for identifying a transmission destination and a transmission source, and a voice portion and a data frame of a predetermined length are alternately and continuously arranged in the data portion, and the data frame further includes data. A transmitting unit that generates a packet in which a mini-header in which information indicating the type of is described is inserted;
A receiver that reproduces the packet from the received wireless signal and extracts data of the digital audio signal from the packet;
A controller that transmits data necessary for generating a packet including various commands and the identifier to the transmission unit, and instructs the reception unit to reproduce the packet from the received radio signal ,
Each wireless device A / D converts and encodes an analog voice signal into a digital voice signal, generates the packet including the digital voice signal, and further converts the packet into a wireless signal and transmits the packet. And receiving the packet converted into a wireless signal, extracting a digital voice signal from the packet, and converting the packet into an analog voice signal,
The controller of the transmitter-side radio, to said transmitting unit transmits a first command for instructing the start of transmission when detecting the start of a voice call, and packet when detecting the end of voice communication Send a second command to change the form,
Before Kioku trust unit,
When the first command is received from the controller, data of an audio signal is inserted into the audio frame, and a packet in which data for data communication is inserted into the data frame is generated.
When the second command is received from the controller, data for data communication is inserted into the voice frame and the data frame for a certain period from the time point, and a packet in which a closing frame is finally inserted is generated.
The controller of the receiving side radio that receives a radio signal, analyzes the information of Minihedda extracted from the packet reproduced by the reception unit, check the type of data that is inserted into the speech frame,
The wireless communication method, wherein the receiving unit extracts data from the packet in accordance with the confirmation result of the controller and reproduces data for the digital voice signal and data communication. The header portion includes at least data of an identifier for identifying a transmission destination and a transmission source radio station, and an audio frame and a data frame of a predetermined length are alternately and continuously arranged in the data portion. A transmission unit that generates a packet in which a mini header in which information indicating the type of the information is described is inserted, and a controller that transmits data necessary for generating a packet including various commands and the identifier to the transmission unit , And
In the transmitting unit, it generates a packet containing the digital audio signal to analog audio signal to A / D conversion and encoding, further, there in a method of generating packet definitive in radio equipment for transmitting and converting the packet into a radio signal ,
The controller transmits, to the transmission unit, a first command instructing start of transmission when detecting start of voice call, and instructs change of form of packet when end of voice call is detected. Send a second command to
The transmission unit is
When the first command is received from the controller, data of an audio signal is inserted into the audio frame, and a packet in which data for data communication is inserted into the data frame is generated.
When the second command is received from the controller, data for data communication is inserted into the voice frame and the data frame for a certain period of time from that point of time, and a packet in which the closing frame is finally inserted is generated. A method of generating characteristic packets. A receiver comprising: a radio signal including a packet generated by the packet generation method according to claim 13; reproducing the packet from the radio signal; and extracting digital audio signal data from the packet.
The controller analyzes information of a mini header extracted from the packet reproduced by the receiving unit, and confirms a type of data inserted in the voice frame;
A method of reproducing data from a packet, wherein the receiving unit extracts data from the packet according to a confirmation result of the controller, and reproduces data for the digital audio signal and data communication.   15. The method of reproducing data from a packet according to claim 14, wherein said transmitting unit stops generation of said packet when there is no data for data communication to be inserted into said voice frame and data frame during said fixed period.   The packet according to claim 14 or 15, wherein the controller does not transmit the second command to the transmission unit when there is no data communication data to be transmitted when detecting the end of the voice call. How to play data from   17. The controller according to any one of claims 14 to 16, wherein the controller detects the start of a voice call when the PTT switch is turned on and detects the end of the audio signal when the PTT switch is turned off. How to recover data from packets.

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